对“_Unwind_GetIP”的未定义引用

Question

我在 rustc 为三重 arm-linux-androideabi 编译 staticlib 到 link 在 Android Studio 中很好地编译时遇到了一些麻烦.

采取的步骤...

通过 multirust
为 Android API v14
使用 --target=arm-linux-androideabi
在 Android Studio

jniLibs/

为钩子创建一个小的 C++ shim to/from JNI
构建和link（几乎）

构建我的 crate 时，我得到以下输出：

note: link against the following native artifacts when linking 
      against this static library
note: the order and any duplication can be significant on some platforms, 
      and so may need to be preserved
note: library: c
note: library: m
note: library: dl
note: library: log
note: library: gcc
note: library: c
note: library: m

所以很自然地，我的 Android.mk 在使用静态库时包含了这些库。

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
LOCAL_MODULE := hydrogen
LOCAL_SRC_FILES := ../jniLibs/$(TARGET_ARCH_ABI)/libhydrogen.a
include $(PREBUILT_STATIC_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := hydrogen-android
LOCAL_SRC_FILES := shim.cpp
LOCAL_STATIC_LIBRARIES := hydrogen
LOCAL_LDLIBS := -lc -lm -ldl -llog -lgcc -lc -lm
include $(BUILD_SHARED_LIBRARY)

在 Android Studio 中构建为我提供以下输出：

:app:buildCppShim
Android NDK: WARNING:/Android.mk:hydrogen: non-system libraries in linker flags: -lgcc -lgccunwind    
Android NDK:     This is likely to result in incorrect builds. Try using LOCAL_STATIC_LIBRARIES    
Android NDK:     or LOCAL_SHARED_LIBRARIES instead to list the library dependencies of the    
Android NDK:     current module    

[armeabi] Compile++ thumb: hydrogen-android <= shim.cpp
[armeabi] SharedLibrary  : libhydrogen-android.so
[snipped]function sync::rwlock::StaticRwLock::read::ha5ec9717ccd1ed83Lxp: error: undefined reference to 'pthread_rwlock_rdlock'
[snipped]function sys_common::rwlock::RWLock::read::h7f3d472c79e2e1e2Z1q: error: undefined reference to 'pthread_rwlock_rdlock'
[snipped]function sys_common::rwlock::RWLock::read_unlock::hd7d67e9c5c47b9f5B2q: error: undefined reference to 'pthread_rwlock_unlock'
[snipped]function sync::rwlock::StaticRwLock::try_read::hddd396186cced62f8xp: error: undefined reference to 'pthread_rwlock_tryrdlock'
[snipped]function sys_common::rwlock::RWLock::try_read::ha5aede723e91a3c881q: error: undefined reference to 'pthread_rwlock_tryrdlock'
[snipped]function sync::rwlock::StaticRwLock::write::h787666bb30e75d28Ryp: error: undefined reference to 'pthread_rwlock_wrlock'
[snipped]function sys_common::rwlock::RWLock::write::h0273da9a7ade68c0i2q: error: undefined reference to 'pthread_rwlock_wrlock'
[snipped]function sync..rwlock..RwLockWriteGuard$LT$$LP$$RP$$GT$::drop.34348::h4c8fbe45843b9a01: error: undefined reference to 'pthread_rwlock_unlock'
[snipped]function sync::rwlock::StaticRwLock::try_write::h5d30a7fdd53c86b4ezp: error: undefined reference to 'pthread_rwlock_trywrlock'
[snipped]function sys_common::rwlock::RWLock::try_write::h0ec4bcc0cb460718r2q: error: undefined reference to 'pthread_rwlock_trywrlock'
[snipped]function sync::rwlock::StaticRwLock::destroy::ha1e9f51e62905aedXzp: error: undefined reference to 'pthread_rwlock_destroy'
[snipped]function sys_common::rwlock::RWLock::destroy::h602ce773ff2356e6T2q: error: undefined reference to 'pthread_rwlock_destroy'
[snipped]function sys::rwlock::RWLock::read::h241f5fdff06a76ab00u: error: undefined reference to 'pthread_rwlock_rdlock'
[snipped]function sys::rwlock::RWLock::write::h48034b52e6491ea4h3u: error: undefined reference to 'pthread_rwlock_wrlock'

~/bin/rust/src/compiler-rt/lib/builtins/gcc_personality_v0.c
Error:(206) undefined reference to '_Unwind_GetIP'
Error:(273) undefined reference to '_Unwind_SetGR'
Error:(274) undefined reference to '_Unwind_SetGR'
Error:(275) undefined reference to '_Unwind_SetIP'

线程错误 我不确定为什么会收到有关 pthread 的错误，因为我的 shim 中有 #include <pthread.h>，并且这些函数在 Android's pthread.

中定义

展开错误 为此，我尝试在 shim 中包含 unwind.h 并在 Android.mk 中包含 libgccunwind.a，但仍然会抛出相同的错误。我发现 this thread 黑客解决方案是在 shim 中声明原型，但是当我这样做时，我收到以下关于 unwind.h

的错误

Error:(231, 3) error: previous declaration 'void _Unwind_SetGR(_Unwind_Context*, int, _Unwind_Word)' here

所以，当我声明它们时它能够找到它们的声明，因为它们冲突，但如果我不声明它们就不知道它们在哪里？我假设我的 linking 命令一定有问题，但不确定如何解决它，因为在拉入生锈创建的库后，所需的库被 linked 反对。

如有任何帮助，我们将不胜感激！

编辑 1 在创建共享库期间将 makefile 调整为 link。

Answer 1

LOCAL_LDLIBS 对于静态库没有意义（静态库不链接）。每当您在真正的二进制文件（如共享库或可执行文件）中使用该库时，您都需要添加这些库。

Answer 2

解决方案恰好是构建 unwind 并包括一些可移植性 headers。请参阅模块示例 here

对“_Unwind_GetIP”的未定义引用

Undefined reference to '_Unwind_GetIP'

linker

makefile

cross-compiling

android-ndk

rust